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CAD/CAM. Design Process and the role of CAD. Design Process. Engineering and manufacturing together form largest single economic activity of western civilization Distinguishing feature of wealthy economies . Design Process. Engineers and designers have turned to machines for assistance

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CAD/CAM

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Cad cam

CAD/CAM

Design Process and the role of CAD


Design process

Design Process

  • Engineering and manufacturing together form largest single economic activity of western civilization

  • Distinguishing feature of wealthy economies


Design process1

Design Process

  • Engineers and designers have turned to machines for assistance

  • Machines are computers and their task is information processing


Design process2

Design Process

  • Clarification of task

  • Conceptual design

  • Embodiment of design

  • Detail design


Design process3

Design Process

  • Reduction of time for product design and development has led to:

  • Simultaneous engineering or

  • Concurrent engineering


Modeling and communication

Modeling and Communication

  • Models represent a physical artifact before it exists

  • Models vary in construction depending on what component is to be evaluated, manipulated or refined

  • Models can exist as different representations


Modeling and communication1

Modeling and Communication

  • Major role of models is communication between participants of the design process

  • Design is sharing information and models are the means of communicating information


Types of design models

Types of Design Models

  • Dependant on the property to be evaluated or communicated

  • Function

  • Structure

    • How parts are assembled

  • Materials

  • Surface condition

  • Dimensions


Types of design models1

Types of Design Models

  • Engineering is primarily concerned with form and structure

  • Most appropriate method to represent these has been graphical


Types of design models2

Types of Design Models

  • Form design is done with drawings that define shape, and arrangement of component parts of the design

  • Structure of the assembly is concerned with the way these are connected together and with flows (energy or material) between parts; SystemEngineering


Types of design models3

Types of Design Models

  • Target receiver for the communication will determine the technique used to generate the model

  • It is crucial to avoid misinterpretation and ambiguity

  • Design models must conform to agreed standards


Application of design models

Application of Design Models

  • Consider the receiver of communication

  • Two main classifications:

    • Evaluating

      • Actions taken to asses properties or merit

    • Generative

      • Actions that provide information from the model for downstream use (manufacture)


Application of design models1

Application of Design Models

  • Visual assessment to ensure no obvious weak areas

  • Assessment of the mass of the components

  • Evaluation of loads in components

  • Evaluation of stresses using FEA


Traditional design process

Traditional Design Process

  • “Over the wall approach”

  • Communication barriers are as high as the wall

  • Concurrent engineering breaks down barriers enabling more responsive product development and higher product quality


Modeling using cad

Modeling using CAD

  • Design is progressively refined in the abstract until it is completely defined for manufacture or construction


Modeling using cad1

Modeling using CAD

  • Models of the functional and other customer requirements for the design

    • These may change and develop as the design progresses

  • Models of the constraints on the design

    • Available materials or manufacturing capability


Modeling using cad2

Modeling using CAD

  • Models of loads imposed on the design

  • Models used to evaluate the performance of design

    • Stress, thermal analysis, aerodynamic assessment


Objective of cad

Objective of CAD

  • Apply computers to both modeling and communication of designs

  • Basic level use computers to automate or assist in tasks such as drawings, diagrams, parts list, BOM

  • Advanced level provide new techniques to assist designer in the process of design


Cad system architecture

CAD system Architecture

  • Hardware

    • Computer and peripherals

  • Software

    • Programs running on hardware

  • Data

    • Data structure created and manipulated by the software

  • Human knowledge and activities


Secret software data base

Secret Software Data Base

  • Model definition

    • To add geometric elements to a model of the form of a component

  • Model manipulation

    • Move, copy, delete, edit or modify elements in the design model


Secret software data base1

Secret Software Data Base

  • Picture generation

    • To generate images of design model on a screen or hard copy device

  • User interaction

    • Handle commands input by user and present output to user


Secret software data base2

Secret Software Data Base

  • Data base management

    • Process the files that make up the data base

  • Applications

    • Those elements of software that do not modify the model but generate information for evaluation analysis or manufacture


Conclusion

Conclusion

  • Cad provides techniques for developing various ways to model a design

  • Cad can describe a design while it is still an abstract concept and communicating this description throughout the entire process


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